Window ventilator heater



March 1, 1949. T, w GLYNN WINDOW VENTILATOR HEATER Filed Feb. 6, 1945 IN V EN TOR.

Patented Mar. 1, 1949 WINDOW VENTILATOR HEATER Theodore W. Glynn, Kingsport, Tenn., assignor to Blue Ridge Glass Corporation, Kingsport, Tenn, a corporation of New York Application February 6, 1945, Serial No. 576,431

1 Claim. 1 This invention relates to a window ventilator screen adapted not only to intercept drafts through an open window but to serve both to heat the entering air and as heating means to the room, it being adapted to easily replace the screens now in use.

For this purpose, my invention comprises a glass panel adapted to be slipped into the supporting brackets commonly fastened to window casings.

My invention is characterized by a panel consisting of two adjacent but not rigidly bound sheets of glass, the inner surface of one of which has applied thereto a conducting grid, which when heated by the passage of electric current therethrough serves as a source of heat.

While electric heating elements consisting of a glass backing having a conducting grid thereon are known, special provision must be made for the use now had in mind, and, therefore, my invention consists in the arrangements hereinafter pointed out.

Referring to the accompanying drawings in which corresponding parts are designated by corresponding marks of reference Figure 1 is an elevation of an assemblage embodying my invention;

Figure 2 is a fragmental horizontal section on line X -X Figure 3 is a fragmental vertical section on line X -X The sheet A is of the desired width and of a length to fit within the casing brackets indicated by dotted lines in Figure 2 and has against its inner face, but not secured therewith, a second sheet B of somewhat less width and length.

On the inner face of the sheet B; i.e., that face adjacent to the sheet A, is deposited a conducting metal grid C having its ends connected with suitable conducting wires of a connecting cord 0.

The grid may be deposited aluminum and the maximum temperature to which it may be raised will depend on the thermal endurance of the glass of which the plates are made. A glass of high thermal resistance should therefore be employed. Tempered glass can be used to advantage.

The conducting grid does not extend over the entire surface of the sheet B, a narrow uncovered rim being left around the edges of the latter.

The only connection between the two sheets A and B is formed by a metallic frame D.

By making the exterior sheet A larger than the grid carrying sheet B, protection against driving water is afforded to the grid element as well as protection against accidental contact with external parts.

The two sheets A and B are held together by a sheet metallic frame D, consisting of top and bottom members cl, and two side members cl. The top members (see Fig. 3) each have a channel d therein to receive the edge of the larger sheet, and a web d connected with one wall of the channel by a shoulder 41. The side members consist of two webs d and (i connected by a shoulder (1 similar to the shoulders d of the top and bottom members. These shoulders form a recess to receive the smaller plate.

In assembling the parts the smaller sheet B is placed with the recess formed by the shoulders 01 and d resting on the webs d and (1 The top and bottom edges of the larger sheet are then slid endwise into the channels 03 thus holding the smaller sheet in its recess. If desired the larger sheet may then be retained against further endwise movement by any suitable means, as by crimping the outer edges of the webs 03 as shown at d If desired, the sheet A may have its surface in contact with the sheet B fluted so that horizontal channels are provided between the two sheets, as is shown in dotted lines at a in Fig. 3.

Having thus described my invention what I claim is:

A heating unit comprising two sheets of glass positioned adjacent to and in contact face-to-face With each other without permanent connection, one of said sheets having a conducting grid deposited on its inner face, the last named sheet being shorter and narrower than the other, in combination with a frame therefor having a channelled bottom and top members to receive the edges of the larger sheet and two side members, said members being each provided with a shoulder to position the smaller sheet in respect to the larger one and a web projecting inwardly therefrom between which and the edges of the larger sheet the edges of the smaller sheet are positioned.

THEODORE W. GLYNN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,515,308 Maul Nov. 11, 1924 1,741,562 Faguy Dec. 31, 1929 1,910,701 Lebau May 23, 1933 2,021,661 Kisfaludy Nov. 19, 1935 2,119,680 Long June 7, 1938 2,179,934 Jones Nov. 14, 1939 2,231,236 Wentworth Feb. 11, 1941 FOREIGN PATENTS Number Country Date 164,435 Great Britain May 24, 1921 173,777 Great Britain Oct. 5, 1922 

